GOSHEN — A New York City firefighter has the second probable case of swine flu identified in Orange County, state and county officials said Thursday, a day after the first case was announced.

The first instance involved a nursing assistant at The Valley View Center for Nursing Care and Rehabilitation in Goshen. County officials have said the worker vacationed in Mexico, where the disease is believed to have originated, and returned to work at the county-run nursing home for several days last week before going home ill.

On Thursday, officials said three Valley View residents were being tested for swine flu after exhibiting mild, flu-like symptoms. They have promised to treat all 360 residents with the anti-viral drug Tamiflu and offer the same medication to all 550 employees of the facility.

The Orange County Health Department has screened more than 30 potential flu cases and sent swabs from three patients to a state laboratory near Albany, resulting in the two “probable” diagnoses of swine flu. Those results must be confirmed by the U.S. Centers for Disease Control and Prevention.

State officials announced Thursday they will no longer test samples in counties where swine flu has already been identified unless the patient has been hospitalized or is severely ill.

The three Valley View residents tested on Thursday don’t fit that description. County spokesman Richard Mayfield said their samples were taken anyway as a precaution, because of the potential for flu outbreaks in a nursing home.

A state Health Department spokeswoman said there were now eight probable cases and 89 suspected cases of swine flu in New York outside of New York City, where at least 50 people were sickened by an outbreak at a private school in Queens.